Jet.com launched to much hype in 2015 with the ambitious goal of taking on Amazon, the undisputed king of e-commerce in the U.S.

And since its debut, Jet.com has effectively raised awareness among consumers about its existence. The problem, however, is that few people are actually shopping there, according to new data from Prosper Insights.

The majority of U.S. adult shoppers have heard of Jet.com, as awareness of the site quadrupled from August 2015 to June 2016. That is undoubtedly impressive for a company that is less than a year old, and it also speaks to the hundreds of millions of dollars the company spent on marketing and advertising since its debut.

Unfortunately, all that effort has not borne enough fruit, at least not yet. Only one in every 20 U.S. adults have bought a product on Jet.com, and only one-third of those customers came back and made a repeat purchase.

This is a major problem for Jet.com as it nears its one-year anniversary, especially because it gave up on its subscription business model that would have likely helped create repeat shoppers. More importantly, the company eliminated the subscription model within the three-month free trial period for members, so it generated zero revenue from membership fees.